Sidewall element



FIG. 1 is a front elevational view of a sidewall element showing my new design; and,

FIG. 2 is a front elevational view of a second embodiment thereof showing the disclaimed portions of FIG. 1 in solid lines.

In the drawings, the broken lines showing of the tire tread, inner bead and the peripheral boundary between the tire tread and the sidewall in FIG. 1 depict environmental subject matter and form no part of the claim. 

The ornamental design for a sidewall element, as shown and described. 